The geological formations from Ţaga area (Cluj District) are Sarmatian in age (in outcrops) and Badenian (under surface). Lithologically, they are represented mainly by sands and sometimes fine sediments (clays, marls), interbedded with volcanic tuffs a low fossil content. The Badenian is the host of gas accumulations, concentrated in dome structures.
A study on the geology of the Ţaga region (Cluj district),
Studia UBB Geologia
Available at: http://scholarcommons.usf.edu/geologia/vol48/iss2/art3